Violet tungsten oxide (WO2.27, Violet Tungsten Oxide, the English abbreviation of purple tungsten is VTO), named for its purple appearance, is recognized by the industry as the best raw material for producing ultra-fine or nano-scale tungsten powder, purple tungsten oxide It is mainly used in the production of metal tungsten powder and tungsten carbide. In addition, there are a few literatures showing that purple tungsten oxide can be used in gas-sensing detection equipment.
The physical properties of purple tungsten oxide determine the quality of ultrafine tungsten carbide or ultrafine tungsten powder, and the chemical properties of purple tungsten oxide determine the preparation effect of purple tungsten oxide itself. Violet tungsten is insoluble in water and ethanol; but , because the oxides of tungsten are all acidic oxides, so purple tungsten will dissolve in alkaline solution. In addition, it should be noted that purple tungsten oxide is not suitable for doping.
Purple tungsten oxide is obtained by reacting pure ammonium paratungstate in argon, and then deoxidizes purple tungsten oxide to make tungsten powder particles. (Purity: 99.99%, dew point -40°C), tungsten powder is oxidized in air. The hydrogen reduction of violet tungsten not only starts from the active centers on the surface of the polymer, but also starts from the inside of the polymer.
Purple tungsten oxide has high thermal stability, and its preparation temperature is kept between 790-850°C. In this temperature range, the inert gas in the reduction furnace penetrates and the water vapor escapes, and the prepared tungsten oxide The powder particle size is uniform and the synthesis speed is fast.
Violet tungsten oxide has high chemical activity. Violet tungsten can be used to produce ultra-fine tungsten powder or nano-tungsten powder with better quality at a lower cost than yellow tungsten or blue tungsten. The prepared tungsten powder is a gas that can detect NO2 sensitively. One of the sensitive materials, it has better selectivity than yellow tungsten oxide, and its gas-sensing performance has more than doubled. It is suitable for the detection of industrial waste gas and environmental pollution gas.
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